Polyethylene (lub npe hu ua PE) yog ib qho ntawm cov yas siv ntau tshaj plaws hauv lub neej txhua hnub. Nws yog dav siv hauv kev tsim cov hnab yas, cov yeeb yaj kiab, cov thoob thiab lwm yam khoom. Nws kuj yog hom tseem ceeb ntawm cov pov tseg yas hauv ntiaj teb.
Polyethylene tuaj yeem suav tias yog pob tshab hauv lub xeev zaj duab xis, tab sis thaum nws muaj nyob rau hauv daim ntawv thaiv, nws yuav muaj lub teeb tawg tawg thiab ua opaque vim muaj cov muaju ntau hauv. Lub degree ntawm crystallization ntawm polyethylene yog cuam tshuam los ntawm tus naj npawb ntawm nws cov ceg. Qhov ntau ceg, qhov nyuaj dua nws yog crystallize. Lub melting kub ntawm polyethylene crystals kuj cuam tshuam los ntawm cov ceg ntoo, xws li ntawm 90 degrees Celsius mus rau 130 degrees Celsius. Cov ceg ntau dua, qhov kub ntawm melting qis dua. Polyethylene ib leeg muaju feem ntau tuaj yeem npaj tau los ntawm kev ua kom cov khoom siv high-density polyethylene hauv xylene saum 130 degrees Celsius.
Polyethylene yog cais raws li nws qhov ntom thiab branching. Nws cov khoom siv kho tshuab yog nyob ntawm qhov sib txawv xws li qib thiab hom branching, siv lead ua qauv thiab qhov hnyav molecular.
Muaj ntau ntau hom polyethylene:
UHMWPE (Ultra High Molecular Nyhav Polyethylene)
ULMWPE (Ultra Low Molecular Nyhav Polyethylene lossis PE-WAX, Polyethylene wax)
HMWPE (High Molecular Nyhav Polyethylene)
HDPE (High Density Polyethylene) tseem hu ua low-pressure polyethylene. Vim tias nws yog tsim nyob rau hauv qhov tsis tshua muaj siab, nws muaj cov hlua ntev ntev thiab muaj qhov ntom ntom ntom ntom. Nws yog tsuas yog siv los ua ntau yam kev txhaj tshuaj molding, tshuab moulding thiab extrusion khoom.
MDPE (Medium Density Polyethylene)
LDPE (Low Density Polyethylene) yog tsim los ntawm txoj kev siab siab (147.17-196.2MPa). Nws muaj ntau ceg thiab tsis muaj zog. Nws feem ntau yog siv los tsim cov khoom ua yeeb yaj kiab.
LLDPE (Linear Low Density Polyethylene)
VLDPE (Very Low Density Polyethylene)
CPE (Chlorinated Polyethylene)